“It remains to mention some of the ways in which people have spoken misleadingly of logical form. One of the commonest of these is to talk of ' the logical form' of a statement; as if a statement could never have more than one kind of formal power; as if statements could, in respect of their formal powers, be grouped in mutually exclusive classes, like animals at a zoo in respect of their species. But to say that a statement is of some one logical form is simply to point to a certain general class of, e. g., valid inferences, in which the statement can play a certain role. It is not to exclude the possibility of there being other general classes of valid inferences in which the statement can play a certain role.”

—  P. F. Strawson

Source: Introduction to Logical Theory (1952), p. 53 as cited in: Ian Hacking (1975) Why Does Language Matter to Philosophy?, p. 83.

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British philosopher 1919–2006

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